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光斑尺寸对连续激光辐照铝合金温度响应影响研究

文康 李和章 马壮 高丽红 王富耻 李文智

文康, 李和章, 马壮, 高丽红, 王富耻, 李文智. 光斑尺寸对连续激光辐照铝合金温度响应影响研究[J]. 中国光学(中英文), 2020, 13(5): 1023-1031. doi: 10.37188/CO.2020-0022
引用本文: 文康, 李和章, 马壮, 高丽红, 王富耻, 李文智. 光斑尺寸对连续激光辐照铝合金温度响应影响研究[J]. 中国光学(中英文), 2020, 13(5): 1023-1031. doi: 10.37188/CO.2020-0022
WEN Kang, LI He-zhang, MA Zhuang, GAO Li-hong, WANG Fu-chi, LI Wen-zhi. Effects of spot size on the temperature response of an aluminum alloy irradiated by a continuous laser[J]. Chinese Optics, 2020, 13(5): 1023-1031. doi: 10.37188/CO.2020-0022
Citation: WEN Kang, LI He-zhang, MA Zhuang, GAO Li-hong, WANG Fu-chi, LI Wen-zhi. Effects of spot size on the temperature response of an aluminum alloy irradiated by a continuous laser[J]. Chinese Optics, 2020, 13(5): 1023-1031. doi: 10.37188/CO.2020-0022

光斑尺寸对连续激光辐照铝合金温度响应影响研究

doi: 10.37188/CO.2020-0022
基金项目: 国家自然科学基金项目(No. 52073029)
详细信息
    作者简介:

    文 康(1994—),男,江西萍乡人,硕士研究生,2017年于北京理工大学获得学士学位,主要从事激光对物质作用机理方面的研究。E-mail:751146409@qq.com

    马 壮(1974—),男,河北昌黎人,博士,教授,博士生导师,1996 年、2001 年于北京理工大学分别获得学士、博士学位,主要从事高温高能防护涂层材料和金属/陶瓷复合材料方面的研究。E-mail:hstrong929@bit.edu.cn

  • 中图分类号: O434.34;O439

Effects of spot size on the temperature response of an aluminum alloy irradiated by a continuous laser

Funds: Supported by National Natural Science Foundation of China (No. 52073029)
More Information
  • 摘要: 为了探究不同光斑尺寸连续激光辐照6061铝合金的温度响应及热致损伤问题,基于ANSYS有限元软件建立了激光辐照下的三维物理模型;使用不同的激光参数进行激光辐照实验,根据所采集的温度和前表面散射光强度数据,反演计算了靶材在激光辐照过程中吸收率的动态变化;最后,利用优化后的模型分析了不同光斑尺寸下,激光辐照靶材的温升特点。研究结果表明:在1000 W/cm2的激光辐照条件下,材料的吸收率随着温度的升高而升高;由于激光加载的局域化特征,横向热扩散影响纵向温升,光斑足够大时该影响变小,这与其热扩散长度有关;对于4 mm厚的6061铝合金材料,当光斑尺寸大于10 cm时,光斑影响可以忽略,靶材背表面发生熔融损伤时间阈值保持2.6 s不变。

     

  • 图 1  三维有限元仿真模型

    Figure 1.  The three-dimensional finite element simulation model

    图 2  材料的密度(a)、热导率(b)、热焓(c)随温度的变化情况

    Figure 2.  Change of thermal properties of the material with temperature. (a) Density; (b) thermal conductivity; (c) enthapy

    图 3  6061铝合金反射率图谱

    Figure 3.  Reflectivity spectrum of 6061 aluminum alloy

    图 4  在1000 W/cm2激光辐照条件下铝合金背面中心位置的温升曲线

    Figure 4.  Temperature rise curves at the center of aluminum alloy back under 1000 W/cm2 laser irradiation

    图 5  吸收率反演计算流程

    Figure 5.  Absorptivity inversion calculation process

    图 6  激光辐照下铝合金前-背表面中心位置的温升曲线。(a)1000 W/cm2;(b)1500 W/cm2;(c)2000 W/cm2

    Figure 6.  Front-rear surface temperature as a function of time in the central area under laser irradiation. (a) 1 000 W/cm2; (b) 1 500 W/cm2; (c) 2 000 W/cm2

    图 7  不同光斑尺寸的激光辐照下铝合金前-背表面中心的温升曲线

    Figure 7.  Front-rear surface temperature as a function of time in the central area under laser irradiation with different spot sizes

    图 8  不同尺寸光斑激光辐照下铝合金前表面温度分布。(a)5 cm×5 cm;(b)10 cm×10 cm;(c)30 cm×30 cm;(d)50 cm×50 cm;(e)温度随R的变化图;(f)温度梯度随R的变化图

    Figure 8.  Temperature distribution in the front surface of aluminum alloy under laser irradiation with different spot sizes. (a) 5 cm×5 cm; (b) 10 cm×10 cm; (c) 30 cm×30 cm; (d) 50 cm×50 cm; (e) graph of temperature vs $R$; (f) graph of temperature gradient vs $R$

    图 9  光斑尺寸为30 cm×30 cm的激光辐照2 s时前表面温度场

    Figure 9.  Temperature field at the front surface when the laser spot size is 30 cm×30 cm and irradiating time is 2 s

    表  1  6061铝合金成分[19]

    Table  1.   Composition of 6061 aluminum alloy (%)

    $w({\rm{Mg}})$$w({\rm{Si}})$$w({\rm{Mn}})$$w({\rm{Fe}})$$w({\rm{Cr}})$$w({\rm{Cu}})$$w({\rm{Zn}})$$w({\rm{Al}})$
    1.060.530.430.380.170.330.16余量
    下载: 导出CSV

    表  2  不同温度下6061铝合金表面换热系数[22]

    Table  2.   Surface heat transfer coefficients of 6061 aluminum alloy at different temperatures

    $T$/(℃)20100200300400500600700
    $h$/( W/m2·℃)8.2211.013.723.233.446.858.068.5
    下载: 导出CSV

    表  3  6061铝合金激光吸收率参数设置

    Table  3.   Parameter settings of laser absorptivity of 6061 aluminum alloy

    Temperature
    range/ (℃)
    0~200200~380380~450450~525525~800
    α0.190.250.270.320.74
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-02-21
  • 修回日期:  2020-03-25
  • 网络出版日期:  2020-09-10
  • 刊出日期:  2020-10-01

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